Control valve



A. P. STEINER CONTROL VALVE Nov. 22; 1927.

Filed Juhe 21. 1926 A. /A .a m m Y. T .a E Lw n m A ill( A other words I have provided one inlet and Patented Nev. 22; 1912i..l

UNITED ySTATE 1sN PATENT OFFICE.

AMOS IE. STEINER., 0F WAYNESBORO, PENNSYLVANIA, ASSIGNOR T0 LANDIS TOOL COMPANY, OF WAYNESBORO, PENNSYLVANIA, A. CGRPORATION OF PENNSYL- VANIA.

CONTROL VALVE.

application med :une a1, 192s. serial ne. 117,542.

My said invention relates toa pressure. responsive valve for controlling the supply of a pressure fluid, ory a fi-uid under pressure utilized for operating machinery such as forl example the reciprocating carriage of a grinding machine and it is an object, ofthe rovide a control valve of thisr invention to character which will supplyl anamount of fiuid proportionate to the load which is driven and which will by-pass surplus fluid back to a supply tank until such time as the same is needed, all as will be hereinafter more fully described and claimed.

Referring to the accompanying drawingsl which are made'a part hereof and on which similar reference characters indicate similar parts,

Figure 1l is a central longitudinal section of a control valve constructed in accordance with my invention, and

Figure 2, an elevation taken at right angles to Figure 1.

In the drawings reference character 10 indicates a valve casing, 11 a supply line from the pump to the motor extending -through said casing and 12 a by-pass or over-supplydischarge pipe for returning excess pressure fluid to a supply tank (not shown). Or in two exhaustvpassages in the valve casing. The valve caslng or valve body 11 is provided in its upper end with a piston 13 having a rod 14 which extends through a stuing box 15 of a closure 16, said rod andvclosure for the upper end of the casing having complementary threads. The upper end of the rod 14 is provided with a handle or operating element 17. A second piston 18 is mounted below the piston 13 and a spring 19 holds the .pistons 13 and 18 in spaced relation. In order to hold the spring 19 between the centers of the respective pistons, bosses outer end is provided with a reduced extension 23 having a screw threaded opening in its extremity for reception of`Y an adjustable screw member 23v provided with an enlarged head adapted to bear against the outer end of a slidable sleeve 24 which is slidable on the extension 23 of said valve. A spring 25 is confined between the end of the valve and the sleeve 24 mounted on the extension 23. The interior of the valve body is formed with ports 26 communicating with the line 11 to the pump and to the motor and with the by-pass, or over-supply discharge pipe 12. The lower end of the valve body is provided with a closure 27 which is threaded into the end of the same and an airl outlet 28 is provided to prevent entrapping of air in the casing andhindering operation of the parts.

A ring29 is mounted between the pistons 13 and y18 in the valve body which forms a stop to limit the downward movement of the piston 13 and the upward movement of the piston 18, and an opening or vent 30 is provided through said ring and valve body to prevent air being entrapped in the same between said pistons 13 and 18.

In operation pressure iuid is supplied from a pump (not shown) through pipe line 11 and the valve body 10 to the motor (not shown). When the motor is not operating the pressure fluid runs through the pressure line to the motor and by-passes through the motor tothe tank for the iluid. Fluid also passes fromthe pressure line 11 through the ports 26 and through the discharge pipe 12. When the motor is started Huid pressure in theline 11 and valve casing 10 begins to buil-d up due to the load on the metor, said. pressure acting against the under- Aface of the piston-'18 and through the ports 26 against the underface of the piston or valve 18', moves the pistons 18 and 18 and sleeves 24 upwardly against the action of the spring 19 closing the discharge pipe 12. The movement of the piston 18 is limited by its contact with the ring or stop 29. The' position of the slidable sleeve v24 on its support may be varied by means of the adjustin screw 23', movement in one direction bemg against the action of the spring 25 and partl 'closing the ports 26. The ports may also e partly closed byoperating the hand lever 17 and releasing the pressure on the spring 19. By compressing th\spring 19 a greater fluid pressure is required to lift the pistons `18 and 18 to close the passage through the by-pass or discharge pipe l2 and by cooperative use of the adjustments upon the upper and lower springs`l9 and 25 respectively the device may be made to operate with smaller or greater pressure as desired.

A relief valve may be placed in the pressure line 11 or elsewhere in the system to afford the necessary escape of fluid when the discharge pipe has been closed and the pressure is built up beyond a point where the piston 18 engages the stop 29. l

It will be obvious to those skilled inthe art that various changes may be made in my device without departing from the spirit of the invention and therefore I do not limit myself to what is shown in the drawings and described in the specification but only as indicated in the appended claims.

I-Iaving thus fully described my said 1n'- vention, what I cla1m as new and desire to secure by Letters Patent, is:

1. The combination of a valve casing, a passage through one side of the casing, a passage through another side of the casing, ports forming communication between said passages, a valve stem extending between said ports, a sleeve slidably mounted on said valve stem, a piston supporting said valve stem adapted to be moved longitudinally for positioning the slidable sleeve over the ports to shut 0E communication between the 'passages through the valve casing, substantially as set forth.

2. The combination of a valve casing, a passage through one side of the casing, a passage through another side of the casmg. ports forming communication between said passages, a valve stem extending between said ports, asleevqslidably mounted on said valve stem, apiston supporting said valve stem adapted to be moved longitudinally for positioning the slidable sleeve over the ports to shut off communication between the passages through .the valve casing, and spring means for holding the 'slidable sleeve in one as set forth. Q

extreme position of movement, substantially v3. The combination of a valve casing, a passage through one side'of the casing, a passage through another side of the casing, ports forming communication between said passages, a valve stem extending between said ports, a sleeve slidably mounted on said valve stem, a piston supporting said valve stem adapted to bemoved longitudinally for positioning the slidable sleeve over the ports to shut oil' communication between the passages through. the'valve casing, spring means for holdin the s'lidable sleeve in one extreme position o movement, and means for oomto shut oif communication betweenV the pasl 4. '15,' I

sages through the valve'casing, spring means for holding the slidable sleeve in one extreme position of movement, means for tensioning said spring means, and means for yieldably holding said piston in one position of longitudinal. movement, substantially as set forth.

5. The' combination of a valve casing, a passage through one side of the casing, a passage through another sideof the caslng, ports forming communication between said passages, a valve stem extending between said ports, a sleeve slidably mounted on said valve stem, a piston supporting said valve stem adapted to be moved longitudinallyl for positioning the slidableA sleeve over the ports to shut olf communication between the passages through the valve casing, spring means for holding the slidable sleeve 'in one extreme position of movement, means for tensioning said spring means, means for yieldably holding said piston in one position of longitudinal movement, and means for varying the tension on said piston, substantially as set forth. Y y

6. The combination of a valve casing, a` passage through one side of the casing, a passage through another side of the casmg, ports forming communication between said passages, a valve stem extending between said ports, a sleeve slidably mounted on said valve stem, a piston supporting said valve stem adapted to be moved longitudinally for positioning the slidable sleeve over the ports to shut off communication between passa es through the valve casing, spring means or holding the slidable sleeve in one extreme pof sition of movement, means for tensioning said spring means, means for yieldably holding said piston inone piston of longitudinal movement, means for varying the tension on 115 said piston, and a stop adapted for limiting'l the movement of the piston in one direction and for limiting the adjustment of the compressing means, substantially as set forth.'A

In witness whereof, I have hereunto set 120 my hand at Waynesboro, Pennsylvania, this 15th day of June, A. D. nineteen hundred 

